ex13p is not working for me.

[srsarangi]

Hi,

I was trying to run the default version of ex13p (Eigen-mode solver). I am getting the following error. Can you please help. I tried all kinds of settings.

Error in LOBPCG:
Bad initial vectors: orthonormalization failed
DPOTRF INFO = 4294967296
Eigenvalue lambda 0.00000000000000e+00 Eigenvalue lambda 0.00000000000000e+00

This issue is there in the default example. I am wondering what is the fix?

Thanks a ton
Smruti Sarangi

[v-dobrev]

I don't see this issue in my setup.

Can you post more details about your setup: OS, compiler and its version, MPI and its version, hypre version, metis version, mfem version (or git hash if not using a release).

[srsarangi]

I was able to fix the issue. The fact of the matter is that the latest MacOSx version's Hypre (installed via Port or HomeBrew) is not compatible with MFEM. They don't use the same version of Lapack and OpenBLAS. There is a 32/64 bit issue. It is much better for users to separately download and compile Hypre and make MFEM point to it. This is a far more reliable solution that nicely worked for me. Just a suggestion: An MFEM version should include Hypre and maybe Lapack+Blas such that everything is available locally. Also, separately enabling Metis, Hypre, etc., in the configuration file should not be required. The only configuration options can be: serial version or both the serial and parallel versions. Makes life easy. In any case, advanced configuration can be done by editing the CMakeLists.txt file directly. Smruti Sarangi

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On Fri, Feb 6, 2026 at 11:36 AM Veselin Dobrev ***@***.***> wrote: I don't see this issue in my setup. Can you post more details about your setup: OS, compiler and its version, MPI and its version, hypre version, metis version, mfem version (or git hash if not using a release). — Reply to this email directly, view it on GitHub <#5220 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ANPFTBZNT5QQL2TE6UDCEND4KQVN7AVCNFSM6AAAAACUBJTPUCVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTKNZRGQ3TGOA> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[v-dobrev]

Thank you for posting about how you resolved your issue, and thank you for the suggestion - we will consider it.

I'll close the issue, however, feel free to re-open it if you want.